As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, CABIN AND DEFOG FANS WERE SELECTED TO 'HIGH'. A BURNT SMELL AND SMOKE CAME FROM DEFOG OUTLETS. FANS WERE TURNED OFF AND AIRCRAFT DIVERTED TO CLOSER APT. SMOKE DISSIPATED AFTER TURNING OFF FANS. INVESTIGATION FOUND THE DEFOG FAN WAS INOPERABLE. AIRCRAFT FERRIED TO A LOCATION WHERE MAINTENANCE COULD REPLACE FAN. FAN WAS REPLACED AND AIRCRAFT RETURNED TO SERVICE. (X)